Section 3 - Chemistry

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1. Elements are the primary types of matter. What make one element different from another? a The number of protons, electrons, and neutrons is different. b The number of neutrons is different. c The number of protons and neutrons is different. d The number of protons is different. 2.What is an element's atomic number ? a The number of protons and neutrons in one atom of the element. b The number of protons in an atom of the element. c The mass of one atom. d The order in which it was discovered. 3. What is the name for multiple atoms that are bonded together? 4. What is the difference between an atom and an ion? a An ion is an atom that does not have an equal number of electrons and protons, so it can have a negative or positive charge. b An ion has a higher atomic number than the corresponding atom, and must share its proton with a neutron. c An ion is an atom that turns into a anion or cation when it shares an electron with another element. d An ion is a charged atom that doesn't have the proper balance of neutrons and protons. 5. Match the chemical bond to it's definition: Question 5 options: a metallic b covalent ionic When atoms share electrons so that their outer electron shells are filled. When atoms lose an electron to another atom, balancing the charge of the two atoms. When electrons can flow from atom to atom. When the charge of an atom or a molecule is distorted by a neighboring atom or molecule, setting up a weak attraction between them. 6. When matter changes phase from a solid to a liquid, it is called: Question 6 options: a melting b freezing c condensation d sublimation 7. What needs to happen for a substance to change state from a gas to a liquid...or the opposite? a Pressure, temperature, or both can change. b Both pressure and temperature need to change. c Only pressure needs to change. d Only temperature needs to change. 8. What happens to liquid water at room temperature if the atmospheric pressure is reduced sufficiently? a It bubbles, releasing gases dissolved in the water. b It freezes at room temperature. c It boils/vaporizes at room temperature. d Nothing- boiling and freezing require temperature changes. a The number of protons, electrons, and neutrons is different. b The number of neutrons is different. c The number of protons and neutrons is different. d The number of protons is different..

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17 Testing Your Knowledge s. Why are biologists sointerested inchemistry a. Chemicals are the fundamental parts of all Multiple choice living things. b. Most chemicals are harmful to living things. 1. Which of the following is a trace element, re- They know little about life except the chemi- quired only in small amounts by most living cals it made from. d. you understand the dhemistry of life, you oxygen can make a lot of money. b, iron ie. Everything about life can be knowm by un- derstanding its dhemistry. d, carbon 9. Molecules are always moving, some molecules move faster than others; is a 2. An acid is a substance that their average velocity of movement. dissolves in water. b, forms covalent bonds with other substances. b, heat c. donates hydrogen ions to solutions. d. is a versatile solvent. e, removes hydrogen ions from solutions. How an atom behaves when it comes into con- 10 Which of the following holds atomstogether in tact with other atoms is determined by its a. nucleus. a. ionic bonds between atoms b. size. b. transfer of protons from one atom to another sharing of electrons between atoms d, neutrons. d. loss of neutrons by atoms e sharing of protons between atoms 4. Most of water\'s unique properties result from 11. loe floats because the fact that water molecules a. it is colder than liquid water a. are very small. its molecules are moving faster than in liq- b. tend to repel each other. uid water. extremely large. c it is more dense than liquid water. d. tend to stick together. d its hydrogen molecules bond to the water e are in constant motion. e, its water molecules are farther apart than in 5. Atoms of different phosphorus isotopes a. have different atomic numbers. b, have different numbers of neutrons. 12. Adding acid tends to of a solution. e. react differently with other atoms. a. increase the hydrogen ion concentration and d. have different numbers of electrons. raise the pH e. have different numbers of protons. b, increase the hydrogen ion concentration and lower the PH 6. An ion is formed when an atom c. decrease the hydrogen ion concentration forms a oovalent bond with another atom. and raise the pH b. gains or loses an electron. d. decrease the hydrogen ion ooncentration becomes part of a molecule. and lower the pH d. gains or loses a proton. e. cord,depending on the original acidity e, gains or loses a neutron. 7. The smallest particle of water is Essay a. an atom. 1. List the four elements meeded by living things b a crystal. in large amounts, two others needed in moder- an element. ate amounts, and two elements needed in trace d, a Solution 1. The answer is: b. Iron. Others are macro nutrient, require in higher amounts by the body. 2. The answer is: c. donates hydrogen ions to solutions. Acid is a proton donator. 3. The answer is: e. electrons. How an atom behaves when it comes in contact with other atoms is determined by its electronic configuration and hence electrons. 4. The answer is: d tend to stock togethe.

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